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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386de14b9462fe9c49e729366bb03dd69e46f4b4b3b38812f98d59d77f41570c' 
  AND token = '2SM2AEYeMDO29PdMWiXybf+/lIwZqF+6LmaA7Yw/lQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}